Question

3.9✘9.9+0.39的简便计算

Answer 1

原式等于 5.6*3.9+2.4*3.9 =3.9*（5.6+2.4） =3.9*9 =3.9*（10-1） =39-3.9 =35.1

Answer 2

=0.39*99+0.39
=0.39*（99+1）
=0.39*100
=39

Answer 3

g